<template>
  <div class="login_container">
    <!-- 登录区域 -->
    <div class="login_box">
        <div class="avatar">
            <img src="../assets/logo.png" />
        </div>
        <!-- 登录表单区域 -->
        <!-- 
            label-width: 就是表单前面字符的占位大小
         -->
        <el-form ref="loginFormRef" label-width="0" class="login_form" :model="loginForm" :rules="loginFormRules">
        <span class="login">用户登录</span>
        <!-- 用户名 -->
        <el-form-item prop="username">
            <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user" autocomplete="off"></el-input>
        </el-form-item>
        <!-- 密码 -->
         <el-form-item prop="password">
            <el-input type="password" v-model="loginForm.password" prefix-icon="iconfont icon-3702mima"></el-input>
        </el-form-item>
        <!--按钮区域 -->
        <el-button type="primary" class="btns" @click="login">登录</el-button>
        <el-button type="info" class="btns" @click="resetLoginForm">重置</el-button>
        </el-form>   
    </div>
  </div>
</template>

 <script>
export default {
  data() {
    return {
      // 这是登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 登录表单时的校验规则
      loginFormRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 12, message: '长度在 6 到 12 个字符', trigger: 'blur' }
        ]
      },
      
    }
  },
  methods: {
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields();
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return;
        let {data: res} = await this.$http.post('login', this.loginForm);
        if (res.meta.status !== 200) return this.$message.error('登录失败!');
        this.$message.success('登录成功');
        /*
          1. 将登录成功之后的token, 保存到客户端的sessionStorage中
            1.1 项目中除了登录之外的其他API接口, 必须在登录之后才能访问
            1.2 token 只应在当前刚问打开期间生效, 所以将 token 保存在 sessionStorage 中
        */
       window.sessionStorage.setItem('token', res.data.token);
       // 2. 通过编程式导航转到后台主页, 路由地址是 /home
       this.$router.push('/home');
      })
    }
  }
};
</script>

 <style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}

.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.avatar {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  padding: 10px;
  border: 1px solid #eee;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;

  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}

.login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

 .btns {
      margin: 0 0 10px 120px;
  }

  .login {
    font-size: 18px;
    display: block;
    text-align: center;
    padding: 15px 0;
    color: #bcbcbc;
  }
</style>